Watlow EZ-ZONE RME - Manual (Page 30)

Watlow EZ-ZONE ® RME Module • 27 • Chapter 2 Install and Wire
Connecting and Wiring the Modules
RM System Connections
Components of a RM system can be installed as
stand-alone modules or can be interconnected on
the DIN rail as shown below. When modules are
connected together, power and communications are
shared between modules over the modular back-
plane interconnection. Therefore, bringing the nec-
essary power and communications wiring to any
one connector in slot C is sufficient. The modular
backplane interconnect comes standard with every
module ordered and is generic in nature, meaning
any of the RM modules shown below on the DIN
rail can use it.
RM Controller
Module
RM Expansion
Module
RM Access
Module
RMCxxxxxxxxxAxx RMEx-xxxx-xxxx RMAx-xxxx-xxxx
Slot C Slot C Slot C
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Slot A Slot A
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Slot D
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Slot D
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Slot D
Slot A
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Slot E
CE CD CF 99 98
RUI
EZKB-_ A _ _- _ _ _ _
RM Controller
Module
RM Expansion
Module
RMCxxxxxxxxxAxx
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Slot A
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Slot D
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Slot E
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Slot B
RMEx-xxxx-xxxx
Slot C
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Slot A
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Slot D
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Slot E
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Slot B
Split Rail Configuration
Standard Bus
Address 4
Standard Bus
Address 5
Standard Bus
Address 1
Standard Bus
Address 2
Standard Bus
Address 3
Standard Bus
Inter-module
Bus
CY CX CZ CE CD CF 99 98
Slot B
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Slot B
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Slot E
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Slot E
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Slot B
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CY CX CZ CE CD CF 99 98 CY CX CZ CE CD CF 99 98
CY CX CZ CE CD CF 99 98 CY CX CZ CE CD CF 99 98
Slot C
Power Supply
Low Voltage
Class 2
Standard Bus
Modular backplane interconnect
Notice in the split rail system diagram that
a single power supply is being used across both
DIN rails. One notable consideration when de-
signing the hardware layout would be the avail-
able power supplied and the loading affect of all
of the modules used. Watlow provides three op-
tions for power supplies listed below:
1. 90-264 Vac to 24Vdc @ 31 watts (Part #:
0847-0299-0000)
2. 90-264 Vac to 24Vdc @ 60 watts (Part #:
0847-0300-0000)
3. 90-264 Vac to 24Vdc @ 91 watts (Part #:
0847-0301-0000)
With regards to the modular loading affect, max-
imum power for each is listed below:
1. RMCxxxxxxxxxxxx @ 7 watts
2. RMEx-xxxx-xxxx @ 7 watts
3. RMAx-xxxx-xxxx @ 4 watts
So, in the split rail system diagram, the maxi-
mum current draw on the supply would be 38
Watts.
- 2 RMC modules consumes 14W
- 2 RME modules consumes 14W
- 1 RMA module consumes 4W
- 1 Remote User Interface consumes 6W
With this power requirement the second or third
power supply could be used.
Another hardware configuration scenario
that could present itself (graphic not shown)
would be a configuration that requires more than
one supply. Lets make some assumptions per-
taining to the split rail system diagram shown below.
The power supply used is the 91W supply. The top DIN
rail now has the following modules:
- 2 RMC modules consumes 14W
- 1 RMA consumes 4W
- 11 RME modules consumes 77W
As can now be seen, the total power requirement ex-
ceeds 91W. In this case, another power supply would
be required. To incorporate another supply in this sys-
tem simply disconnect pins 99 and 98 on the remote
DIN rail and connect another appropriately sized pow-
er supply to those same pins.
When using a split rail configuration ensure that
the interconnections for the Inter-module Bus and
Standard Bus do not exceed 200 feet. Standard Bus
and the Inter-module Buses are different protocols
and both are required for split rail configurations.
Without having both connected communications be-
tween modules would not be possible.
Note:
Module is not provided with a disconnect, use of an
external disconnect is required. It should be located in
close proximity to the module and be labeled as the dis-
connect for the module.
Note:
Connecting power supplies in parallel is not allowed.
When power consumption is greater than 91 watts use a
split rail configuration.